Understand your schema,see the impact of every change,design the next one.
Schemity is database design software that reads your live database, shows what every change will do to real data, yours or your AI agent's, and never runs it without you.
2-week trial, every feature unlocked, no credit card. $129 once.
macOS 11 or newer, Apple Silicon or Intel · Windows 10/11 x64 · Ubuntu, Debian x64
From a legacy database to a domain map in four steps
You bring the database and the codebase. Your AI agent does the reading.
- Connect the databaseEvery table drawn as a live ERD at once. Missing foreign keys are inferred and drawn dashed.
- Ask your agent to organize itIt reads your code, and the schema from Schemity over MCP.
- Review what it didEvery step is in History, one undo away. Nothing is saved until you save.
- Read the module dependenciesEach domain is a node; each arrow counts the real foreign keys.
Every schema change, drawn and priced before it runs
Your agent edits the diagram, or writes a schema migration in your codebase. Either way, the change stops here first.
The diagram is the input, not the output
Think on the map: route every relationship line where it helps you see the design, then let the SQL come from it. A foreign key targets the parent's primary key, cardinality follows its uniqueness, and a draft stays dashed until it exists, so an ERD that looks valid is valid.
Give your agent the schema. Keep the key to the database.
Schemity is a local database MCP server with 16 tools. Reads are free and change nothing; edits are staged for you to review.
claude mcp add --scope user schemity -- "/Applications/Schemity.app/Contents/MacOS/schemity" --mcp Also works with Claude Desktop, Cursor, Codex, OpenCode, or any MCP host. Listens only on your machine; its token lives in your OS keychain. Setup guide →
Every property holds whether the hands on the diagram are yours or an agent's
It reads your database
A real connection, re-synced every time you open the diagram, so it never drifts from what is deployed.
The diagram is a file you own
Plain JSON in a folder you choose, reviewed in a pull request like any other change.
Only valid designs can be drawn
Keys, cardinality and names follow the rules a database enforces.
Your agent never gets credentials
A local server, no vendor cloud, and the schema goes only where your agent already sends your code.
No meter on your model
One purchase. No limit on tables, diagrams, workspaces or context views.
Nothing for us to leak
A device ID and your country, for licensing. Nothing that identifies you.
Coming from other data modeling software? Honest comparisons: ChartDB alternative, dbdiagram.io alternative, DbSchema alternative, DrawSQL alternative.
Explore a real schema in your browser, or download the app
The diagram below runs in Schemity Lite, our free online database schema designer. Pan and zoom a sample PostgreSQL schema here, or download the desktop app to connect your own database.
- Every feature, including MCP and impact analysis
- No limits on tables, diagrams or workspaces
- 1 year of updates included, then $69/year only if you want more
- Free forever for education (email us from your .edu address)
2 weeks, no credit card
Point it at your own database.
Know the impact before you change production. Two-week trial with every feature unlocked, and your diagrams stay yours whether you buy or not.
